This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A211113 #24 Jul 24 2025 12:26:55 %S A211113 2,0,7,8,8,6,2,2,4,9,7,7,3,5,4,5,6,6,0,1,7,3,0,6,7,2,5,3,9,7,0,4,9,3, %T A211113 0,2,2,2,6,2,6,8,5,3,1,2,8,7,6,7,2,5,3,7,6,1,0,1,1,3,5,5,7,1,0,6,1,4, %U A211113 7,2,9,1,9,3,2,2,9,2,3,4,0,4,8,7,5,4,3,2,6,6,9,4,0,7,3,3,2,1,5,6,4,3,1,0,9,9,7,5,6 %N A211113 Decimal expansion of -zeta(-1/2). %H A211113 Wikipedia, <a href="http://en.wikipedia.org/wiki/Riemann_zeta_function">Riemann zeta function</a> %F A211113 Equals -zeta(-1/2) = zeta(3/2)/(4*Pi) = A078434/ (10*A019694). %e A211113 0.207886224977354566017306725397049302226... %p A211113 -Zeta(-1/2) ; evalf(%) ; %t A211113 RealDigits[-Zeta[-1/2], 10, 100][[1]] (* _Amiram Eldar_, Mar 24 2021 *) %o A211113 (PARI) -zeta(-1/2) \\ _Charles R Greathouse IV_, May 18 2012 %Y A211113 Cf. A059750, A078434. %K A211113 nonn,cons,easy %O A211113 0,1 %A A211113 _Stanislav Sykora_, May 17 2012